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https://issues.apache.org/jira/browse/HIVE-7405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14127225#comment-14127225
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Ashutosh Chauhan commented on HIVE-7405:
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Do we really need AggregreateMapReduceUsage enum? Seems like GroupbyDesc.Mode
can be used instead as follows:
AggregreateMapReduceUsage.MAP -> Mode.Hash
AggregreateMapReduceUsage.REDUCE -> Mode.MergePartial
AggregreateMapReduceUsage.MAP_REDUCE -> Mode.all_other
If possible, we should reuse GroupbyDesc.Mode, otherwise these modes can be
mixed and matched and will lead to explosion of combinations.
> Vectorize GROUP BY on the Reduce-Side (Part 1 – Basic)
> ------------------------------------------------------
>
> Key: HIVE-7405
> URL: https://issues.apache.org/jira/browse/HIVE-7405
> Project: Hive
> Issue Type: Sub-task
> Components: Vectorization
> Reporter: Matt McCline
> Assignee: Matt McCline
> Attachments: HIVE-7405.1.patch, HIVE-7405.2.patch, HIVE-7405.3.patch,
> HIVE-7405.4.patch, HIVE-7405.5.patch, HIVE-7405.6.patch, HIVE-7405.7.patch,
> HIVE-7405.8.patch, HIVE-7405.9.patch, HIVE-7405.91.patch, HIVE-7405.92.patch,
> HIVE-7405.93.patch, HIVE-7405.94.patch, HIVE-7405.95.patch,
> HIVE-7405.96.patch, HIVE-7405.97.patch, HIVE-7405.98.patch,
> HIVE-7405.99.patch, HIVE-7405.991.patch, HIVE-7405.994.patch,
> HIVE-7405.995.patch
>
>
> Vectorize the basic case that does not have any count distinct aggregation.
> Add a 4th processing mode in VectorGroupByOperator for reduce where each
> input VectorizedRowBatch has only values for one key at a time. Thus, the
> values in the batch can be aggregated quickly.
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